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Rains activate pre-emerge herbicides

Recent rains were welcomed in some parts of the Corn Belt, and not just because it was getting dry. 

University of Minnesota Extension crops educator Dave Nicolai says moisture plays an important role in an effective weed management program.

“We need that half-inch of rain would be ideal, or irrigation, to put that product into a soil solution so we get activation for weed control on a pre.”

He tells Brownfield residual herbicides help limit the spread of weeds like waterhemp that germinate and emerge over an extended period of time.

“The grower might (also) need to consider if they have a waterhemp-infested field, to make a second application or layering if the herbicide label allows for that.”

Nicolai says beneficial spring weather has allowed Minnesota farmers to set an advanced planting pace and get ahead with herbicide applications.

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